SurfRaptor
FRF Addict
If you are bouncing on the rear bumper and can hear the noise, it should be much easier to track it down. Have one person jump on the bumper while you lay underneath and you can put your hand on different suspension parts and see where it is coming from. My bet would be the spring is not seated perfectly.lol I’m currently looking at moving to a 392 myself. But I’ve been in that world for a while now.